Riveting is the main way of mechanical connection for aircraft structures, and the riveting force is an important factor affecting the quality of riveting. Traditional computation methods of riveting force are usually based on the constant-volume assumption, without considering the volume of the rivet material being pressed into the rivet hole, which caused the big error of the model. To this end, according to the simulation results and the flow trend of rivet material, the volume reduction coefficient is introduced to take into account the volume of the nail bar being pressed into the rivet hole,establishing a prediction model of riveting force and comparing with the available experimental data. The results show that the calculated values are in good agreement with the experimental ones, so this model can be used to predict the magnitude of riveting force in riveting process.